Feature:1. Plastic Material: NPF550 dummy battery is made of high quality plastic materials, lightweight, durable, low temperature resistant, and long service life.2. Good Performance: This dummy battery can be powered by an external mobile power supply. DC port size is about 5.5x2.1mm/0.2x0.08in.3. Applicable Device: NPF550 dummy battery is suitable for power supply for LED supplementary lights, monitors, image transmission and other equipment.4. Good Features: Provide continuous and stable power supply for the camera and extend the working time of the camera. Plug and play, convenient to use.5. Applicable Models: Dummy battery is suitable for Sony NPF550, NPF570, NPF970. Input 12V24V, output 7.4V/3A, with reliable performamce.Specification:Item Type: NPF550 Dummy BatteryMaterial: PlasticInput: 12V-24VOutput: 7.4V/3AColor: As Pictures ShownWeight: Approx. 79g / 2.8ozDC Port Size: Approx. 5.5x2.1mm / 0.2x0.08in (Positive Inside and Negative Outside).Package List:1 x Dummy Battery1 x DC Elbow Cable